Green’s Dictionary of Slang

s.a.m.f.u. n.

[abbr.; var. on s.a.b.u. n. and s.n.a.f.u. n.]

(orig. milit.) self-adjusting military fuck-up.

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[UK]Partridge DSUE (8th edn) 1004/1: 1940–45.
‘Internet Acronyms Dict.’ at www.gaarde.org 🌐 SAMFU. Self-Adjusting Military Fuck Up.